​MPLX, WhiteWater Midstream, and Stonepeak/WTG Proceeding with Whistler Pipeline Project

| Energy Resources
WhiteWater Midstream (WhiteWater) backed by First Infrastructure Capital, and a joint venture between Stonepeak Infrastructure Partners (Stonepeak) andWest Texas Gas, Inc. (WTG) have reached a final investment decision

FINDLAY, Ohio, June 3, 2019 – MPLX LP (NYSE: MPLX), WhiteWater Midstream (WhiteWater) backed by First Infrastructure Capital, and a joint venture between Stonepeak Infrastructure Partners (Stonepeak) andWest Texas Gas, Inc. (WTG) have reached a final investment decision to move forward with the design and construction of the Whistler Pipeline after having secured sufficient firm transportation agreements with shippers. The majority of available capacity on the planned pipeline has been subscribed and committed by long-term transportation agreements. WhiteWater and MPLX expect that the remaining capacity will be fully subscribed in coming months.

The Whistler Pipeline is being designed to transport approximately 2 billion cubic feet per day (Bcf/d) of natural gas through approximately 475 miles of 42-inch pipeline from Waha, Texas, to the Agua Dulce area in South Texas. Supply for the Whistler Pipeline would be sourced from multiple upstream connections in the Permian Basin, including direct connections to plants in the Midland Basin through an approximately 50 mile, 30-inch pipeline lateral, as well as a direct connection to the 1.4 Bcf/d Agua Blanca Pipeline, a joint venture between WhiteWater, MPLX and Targa. Agua Blanca Pipeline crosses through the heart of the Delaware Basin, including portions of Culberson, Loving, Pecos, Reeves, Winkler and Ward counties.

“The decision to move forward with this project after securing sufficient commitments from shippers demonstrates our disciplined approach to investing,” said Gary R. Heminger, MPLX chairman and chief executive officer. “Whistler is expected to provide reliable residue gas transportation out of the Permian Basin, which is vital to our growing gas processing position and producers in the region.”

“The WhiteWater team is excited to partner with MPLX and develop incremental transportation out of the Permian Basin, as production continues to dramatically outperform consensus estimates,” added Christer Rundlof, CEO of WhiteWater. “Whistler will tie directly into the most attractive markets in South Texas, including the growing LNG and Mexican markets.”

The Whistler Pipeline is expected to be in Service in the third quarter of 2021, pending the receipt of customary regulatory and other approvals.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. MPLX’s assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WhiteWater Midstream

WhiteWater Midstream is an Austin based, independent midstream company that provides transportation services to domestic oil and gas plays. WhiteWater was founded in 2016 and is backed by significant commitments from First Infrastructure Capital. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is affiliated with Quanta Services and operated separately as an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About Stonepeak Infrastructure Partners

Stonepeak Infrastructure Partners (www.stonepeakpartners.com) is an infrastructure-focused private equity firm with over $15 billion of assets under management and with offices in New York, Houston and Austin. Stonepeak invests in long-lived, hard-asset businesses and projects that provide essential services to customers, and seeks to actively partner with high-quality management teams, facilitate operational improvements, and provide capital for growth initiatives.

About WTG

WTG (West Texas Gas, Inc. & affiliates) is composed of a family of related natural gas midstream and downstream entities headquartered in Midland, TX since 1976 with operations in more than 90 Texas and Oklahoma counties. These WTG entities operate more than 700 MMcfd of gas processing capacity with more than 10,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

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